Monitor Stand Extender / Pipe Coupler

WARNING:
Objects under constant force will deform over time. (the exact amount depends on material, temperature, force, etc.)
Plastics will DEFINITELY FAIL at some point.

The 3d model has some errors.
My slicer fixed them automatically.

You can use 3 of them to couple two pipes.
I am using it to extend my monitor stand.

I've included the FreeCAD file.
You can use it to generate new meshes with dimensions that suit your needs.